Never melt chocolate ice cream

'But it isn't only chocolate bars that he makes. Oh, dear me, no! He has some really fantastic inventions up his sleeve, Mr Willy Wonka has! Did you know that he's invented a way of making chocolate ice cream so that it stays cold for hours and hours without being in the refrigerator? You can even leave it lying in the sun all morning on a hot day and it won't go runny!'

'But that's impossible!' said little Charlie, staring at his grandfather.

'Of course it's impossible!' cried Grandpa Joe. 'It's completely absurd! But Mr Willy Wonka has done it!'

***

Charlie and the Chocolate Factory, Chapter 2